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Sat, 25 Jan 2020 14:41:45 -0500 X-MC-Unique: 9INydv1jPCy2zEZg_D8bFQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 22CD91800D48; Sat, 25 Jan 2020 19:41:42 +0000 (UTC) Received: from llong.remote.csb (ovpn-121-36.rdu2.redhat.com [10.10.121.36]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0F9172718F; Sat, 25 Jan 2020 19:41:37 +0000 (UTC) Subject: Re: [PATCH v9 0/5] Add NUMA-awareness to qspinlock To: paulmck@kernel.org References: <20200115035920.54451-1-alex.kogan@oracle.com> <20200124222434.GA7196@paulmck-ThinkPad-P72> <6AAE7FC6-F5DE-4067-8BC4-77F27948CD09@oracle.com> <20200125005713.GZ2935@paulmck-ThinkPad-P72> <02defadb-217d-7803-88a1-ec72a37eda28@redhat.com> <20200125045844.GC2935@paulmck-ThinkPad-P72> From: Waiman Long Organization: Red Hat Message-ID: <967f99ee-b781-43f4-d8ba-af83786c429c@redhat.com> Date: Sat, 25 Jan 2020 14:41:39 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20200125045844.GC2935@paulmck-ThinkPad-P72> Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200125_114155_580817_9C425B91 X-CRM114-Status: GOOD ( 15.23 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, guohanjun@huawei.com, Arnd Bergmann , Peter Zijlstra , dave.dice@oracle.com, jglauber@marvell.com, x86@kernel.org, Will Deacon , linux@armlinux.org.uk, linux-kernel@vger.kernel.org, Ingo Molnar , bp@alien8.de, hpa@zytor.com, Alex Kogan , steven.sistare@oracle.com, tglx@linutronix.de, daniel.m.jordan@oracle.com, linux-arm-kernel Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 1/24/20 11:58 PM, Paul E. McKenney wrote: > On Fri, Jan 24, 2020 at 09:17:05PM -0500, Waiman Long wrote: >> On 1/24/20 8:59 PM, Waiman Long wrote: >>>> You called it! I will play with QEMU's -numa argument to see if I can get >>>> CNA to run for me. Please accept my apologies for the false alarm. >>>> >>>> Thanx, Paul >>>> >>> CNA is not currently supported in a VM guest simply because the numa >>> information is not reliable. You will have to run it on baremetal to >>> test it. Sorry for that. >> Correction. There is a command line option to force CNA lock to be used >> in a VM. Use the "numa_spinlock=on" boot command line parameter. > As I understand it, I need to use a series of -numa arguments to qemu > combined with the numa_spinlock=on (or =1) on the kernel command line. > If the kernel thinks that there is only one NUMA node, it appears to > avoid doing CNA. > > Correct? > > Thanx, Paul > In auto-detection mode (the default), CNA will only be turned on when paravirt qspinlock is not enabled first and there are at least 2 numa nodes. The "numa_spinlock=on" option will force it on even when both of the above conditions are false. Cheers, Longman _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel